An FAQ would be a great help
Here's some questions:
What countries is the patent registered in?
How confident are you that the patent is invalid and why (details please)?
Are there any examples of similar patents being invalidated?
How long is the court case likely to run?
When does the patent expire?
What are the likely consequences of not signing Acacia's contract?
What legal assistance if any can IMPA offer webmasters being sued by Acacia?
Is it true that Acacia may be able to garnish payments from a processor or bank if an offshore company refuses to pay?